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play in the snow to enjoy the happiness of winter.But in southern China,temperature seldom
falls below 0C.Snow seldom falls,and the rivers do not freeze.
Heating()is important for northern Chinese.People often wear hats,searfs,down
jackets and gloves outside.But when they return home,they only need a T-shirt.In southern
China however,people don't enjoy heating.They often use air conditioners()or electric
heaters to keep themselves warm during winter.
21.Qinling-Huaihe Line
A.runs from the south to the north
B.got its name in 1980
C.is between northern and southern China
D.divides China into five parts
22.When does the coldest weather come in northern China
A.In December.
B.In November.
C.In February.
D.In January
23.Which difference is Paragraph 3 about
A.The temperatures.
B.The snow.
C.The rain.
D.The clothes.
24.Which one of following pictures is "scarfs"
25.What's the article mainly(主要)about
A.Winter in northern and southern China
B.Differences in weather in many cities
C.How people spend winter in the north.
D.How people spend winter in the south
C
Do you have a smart phone It's very useful-we can use it to take photos,play games
or study.But it can also cause some problems().A large number of people spend over 4
hours a day using their phones-that's 1,460 hours a year,from a study by Thames.If we use
smart phones too much,they can become harmful(有害的)，
Using smart phones too much can be bad for students'study.What about sleep Many
studies show that long smart phone time is bad for students'sleep,too.It can make it hard to
fall asleep and even harder to wake up in the morning.
To find out if using smart phones too much causes poor sleep,scientists asked 1,043
British students of 18~30 years old to finish two questionnaires ()And they find that
using smart phones too much brings people poor sleep.Almost 70%of the students who use
smart phones too much have poor sleep.
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